VOLVO
CEM-U210929 - Back-up battery. General Signal Failures. Signal signal invalid
System
Zentralelektronik (CEM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
2 ModelleV40 (2013–), V40 Cross Country (2013–)
Modelle nach Baujahr und Motor anzeigen (2)
Was bedeutet der Fehlercode?
On the V40, the central electronic module (CEM) monitors the voltage from the back-up battery, a secondary battery. The fault is stored at ignition position II when the CEM receives a signal about the back-up battery that is not valid. The automatic engine start and stop function is then switched off.
Mögliche Ursachen
- Open circuit between the back-up battery and the engine compartment fuse box
- Damaged fuse for the back-up battery
- One of the two engine-bay fuses is damaged
Was Sie tun können
- 1Check the fuses in the engine compartment, especially the two that serve the back-up battery, and replace a blown fuse with a new one of the same rating
- 2Check that the connectors at the back-up battery and in the fuse box are tight and free from oxidation
- 3Use a multimeter to check that the cable from the back-up battery to the fuse box has no break
- 4If you have a diagnostic tool, follow the back-up battery voltage in live data and check that it sits close to the car's other battery voltage
- 5If the fault returns although the fuses and connectors are sound, have a workshop check the supply to the back-up battery
Symptome, die Sie bemerken können2
- The automatic engine start and stop function does not work while driving
- The automatic engine start and stop function does not work at idle
Was der Fehler beeinflussen kann1
- The automatic engine start and stop function is switched off
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.